Method for synchronizing apparatus on a long distance



Oct. 21,1924. 1,512,361

H. M. PETERSEN METHOD SYNCHHONIZING APPARATUS ON A LONG DISTANCE Filed June 18. 1920 Patented Oct. 21, 1924. v

UNITED STATES HEBMOD MAGN E PETERSEN, O'F CHR ISTIANIA, NORWAY.

METHOD FOR SYNQHRONIZING APPARATUS ON A LONG DISTANCE.

Application filed June 18, 1920 Serial No. 389,925.

enable others skilled in the art to which'it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

The present invention relates to the synchronizing of apparatuses which are removed a long distance from each other, and which can not be driven directly from the same source of power such as for instance telegraphs and the like apparatuses interconnected by means of a low current electric transmission or apparatus located at wireless plants communicating with each other by means of electromagnetic waves.

According to the present invention one of the apparatuses to be synchronized is driven by means of alternating current, said alternating current influencing also a vacuum tube placed in proximity to the other apparatus and serving to generate an alternating current synchronous with the original alternating current thereby driving the other apparatus.

In order to make the invention more clearly understood the application of the same on asystem for telegraphic transmission of ictures or the like (copy-telegraphing) 'wil be described inthe following with reference to the accompanying drawing:

1' is an alternating current generator delivering alternating current with a frequency of for instance 1000. The generator is coupled to the primary winding 2 of a transformer 2, 3. 4 is a rotating cylinder on the surface of which the matter to be transmitted has been copied chemigraphically. The lines consist of insulating substance. 5 is a contact spring which is 0 moved axially during the rotation of the cylinder by means of a screw. From the alternating current circuit 1, 2 transmission wires 6, 7 lead to the cylinder, so that the alternating current generator is short-circuited over these wires, when the spring is touching the metal of the cylinder, while the short-ci"r cuiting is interrupted Whenthe spring passes "the full power of the alternating current is transmitted to the line. Experience now shows that sparks are produced by the contact spring 5, said s arks acting to make the picture unclear. 11 order to obviate this drawback a 3-electrode Vacuum tube 8 with screen 9, filament 10 and anode 11 is introduced between the line and transformer 2, 3, said vacuum tube is adapted for amplifying alternating currents with suitable frequency and for increasing the energy for instance from 1 watt to 150 watts or more. Thereby an energy of about 1 watt only is-passed overthe cylinder 4 so that the arrangement may work without sparks at the usual velocity of rotation. When the spring passes an insulating line approximately 1 watt is transmitted to the screen circuit 9, 3, 10 of the vacuum tube, and the vacuum tube increases this energy by means of battery 12 to 150 watts while maintaining the frequency, and form of the alternating current. Through transformer 13, 14 the amplified energy is transmitted to te1egraph line 15, which is provided with regard to the synchronizing arrangement with the usual artificial lines 1617 and 1819. By means of transformer 13, 14 the one is transformed into a current the transmis- Tion of which is suitable for. the telegraph me. station is transformed by means of transformer 20-21 to a tension suitable for producing sparksor the like in a receiving ap aratus 22 placed before the receiving cy 1nder 23. Said receiving apparatus however is no part of the present invention, which relates to the problem of synchronizing the rotation of said cylinder 23 with the rotation of cylinder 4.

At the sending station is placed an alternating current generator 24 vproducin alternating current of say 50 periods. e generator produces the necessary current for driving a synchronous motor 26 controlled by means of'resistance 25 and driving cylinder 4 by means of worm gear 27. At the same time, the generator 24 sends alternating current to point 28 of the secondary The energy arriving at the receiving current is here distributed between the real line 15 and the artificial line 16, 17 and is taken up at point 29 at the receiving station passing from there throiIigh the primary 31 of transformer 30, 31. ere the Weak current arriving is amplified by means of the 3-electrode vacuum tube 32 in the same manner as previously specified for vacuum tube 8 and the amplified current is utilized to drive the synchronous motor 33 driving the receiving cylinder 23 in synchronism with the cylinder 4.

Claims:

1. In the synchronism of distant motors for copying telegraphs, a sending and a receiving station, a line connecting them, a motor at each station, an alternator at the sending station supplying current to the motor at said station and sending current to line, an amplifying circuit at the receiving station, a transformer between the line and said circuit, an audion tube and abattery in said circuit and a second transformer supplying current'to the motor at the receiving station.

2. In the synchronism of distant motors for copying telegraphs, a sending and a receiving station, a llne connecting them, an alternating current motor at each station, a source of alternating current at the sending station supplying current to the motor at said station and sending alternating current to line, an amplifying circuit at the receiving station, transforming means between the line and said circuit, an audion tube and a source of continuous current in said circuit, and means to transform current of said amplifying circuit and supply such transformed current to the motor at the receiving station.

In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribi'n witnesses.

HERMOD MAGNE ETERSEN.

Witnesses:

Roam H. FnAzmn, NATE A. QHED'EUSOHON. 

